Pressure die-casting machine



June 12, 1934.

K. F. WAGNER PRES S URE DIE CASTING IACHINE' 2 Shets-Sheet 1 Filed April 29. 1931- w N II I III.

INVENTOR KQTZ Friedrich Wayne? BY his ATTORNEYS wrwmm- June 12, 1934. K. F. WAGNER 1,962,628

' PRESSURE DIE CASTING MACHINE Filed April 29. 1931 2 Sheets-Sheet 2 INVENTOR XaYZE'z'eaZrick way-122T BY ATTORNEYS Q K Patented June 12, 1934 I UNITED STATES PATENT OFFICE rm'zssunn DIE-CASTING MACHINE poration of Delaware Application April 29, 1931, Serial No. 533,635 In Germany May 1, 1930 9 Claims.

The present invention relates to improvements in pressure die-casting machines and more particularly to machines of this kind in which a molten metal container is provided having a pressure chamber or casting vessel rigidly positioned inside said container, which is, by means of a molten metal inlet passage, successively and at regular intervals refilled with molten metal from the container after every operation.

When employing machines of this type it is of vital importance that the inlet or communication passage Ior conducting the metal from the container into the pressure chamber should be firmly and securely closed before causing pressure to act upon the metal contained in the pressure chamber; otherwise such pressure would be transmitted to the interior of the container and the metal therein. In such case, some of the molten metal might be expelled from the container through the feeding shaft, or the walls of the latter might even be caused to give way.

According to the present invention, the means for controlling the molten metal inlet between the pressure chamber and the metal container is rigidly connected with the mould to be filled by the casting process, and particularly with such part of the mould as is brought into contact or registry with the squirting nozzle of the pressure chamber before pressure is supplied to the latter. As a safeguard is generally provided in machines of this type for preventing the pressure from being supplied before the mould is brought into contact with the nozzle, such arrangement also acts to ensure the closing of the pressure chamber communication passage before pressure is supplied.

In the annexed drawings, a number of particularly advantageous modifications of the present invention is illustrated by way of example.

Fig. 1 represents a vertical cross-section of one embodiment of the invention;

Fig. 2 is a detail illustration by means of a vertical cross-section, on an enlarged scale, showing a preferable mode of rigidly connecting the means for controlling the molten metal inlet passage, between the pressure chamber and the metal container, with the mould;

Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 2;

Fig. 4 is a vertical cross-section of another embodiment of the invention; and

Fig. 5 is a vertical cross-section taken along the line B-B in Fig. 4.

With reference to Fig. 1, c is a metal container which also serves as a melting pot and in which the pressure chamber b is suitably suspended. One end of the latter is provided with a discharging nozzle d, connecting with the gate of the mould e when the latter is lowered, whereas the other end i is suitably connected with the 0 pressure supply. A stem 1c is provided for controlling the operation of the metal inlet passage 1 and this stem is operatively connected by means of a bracket m to the bottom part of the mould e and adjusted in such a manner that communication passage 1 is firmly and securely closed by stem is when mould e comes to rest upon nozzle (1.

When and so long as the mould e is raised above nozzle d, the communication passage 1 is opened so that the molten metal from container c is allowed to fill the pressure chamber 1). When, however, the mould is lowered prior'to the charging and filling step, the communication passage 1 is closed securely by stem It, so that, when pressure is supplied at end i of the pressure chamber, the molten metalin the latter is forced out of the nozzle d into mould e, but cannot escape through inlet passage 1.

In order to reduce the difilculties arising from the difference in heat-dilatation, or expansion, of the various rigidly connected parts of the device, and further so as to enable the stem to be easily replaced and adjusted, the modification illustrated in Figs. 2 and 3 has proved particularly advantageous.

In this modification, stem k is pivotally journalled in the bracket m so as to permit a definite, though limited, angular movement of the stem, whereas its vertical movement is still strictly governed by the movements of the mould. The sphere-shaped end of the stem k is held in the bearing n (consisting of the bearing proper m, and the cap 112 fixed to m by means of screws 12:) rigidly connected with the mould, by means of an annular'ring o, the outer circumference of which is provided with circular grooves registering with circular grooves in bearing m and cap 11.2. An adjustable screw p1, forming a counterbearing for the stem k, is provided and is secured by nut n. Readjustment of stem k is thus possible in an extremely simple manner by removing cap 112, suitably positioning annular ring 0 and fixing screw in in such a manner that the spherical end or stem is is loosely journalled.

The aforedescribed manner of suspending the inlet passage-controlling stem offers the advantage that the lower bearing of the stem which is particularly exposed to the heat from the metal container, does not require to be threaded and is no therefore relatively insensitive to the effects of the heat.

Figs. 4 and 5 represent a somewhat modified device which offers the further advantage that the arrangement employed results in the elimination of the stresses set up in the device by the actuation of the communication passage closing member. In these Figs, 0 again represents the metal container, whereas part b, which in this case is cast integral with part c, is the pressure chamber. One end of the pressure chamber (at i) is connected with a pressure supplying device (not shown), whereas the other end opens into the interior of the container 0, but is shaped in such a manner as to register with the end of a hollow stem k. This stem is rigidly connected with mould e and is guided in an airand pressure-tight manner in a bore h in the melting pot c. 'A resting plane 1 is provided upon which the mould e is lowered and which is fixed at such a distance above the melting pot that the communication passage or inlet a is firmly closed when the mould comes to rest upon its supporting structure 1.

The device described is operated in the following manner:

When the mould is raised the inlet to the pressure chamber is open so that the molten metal can freely flow out of the container into the pressure chamber. 0n lowering the mould e and its attached hollow stem it onto the resting plane I, the communication passage is closed by hollow stem is, which, at the same time, connects the interior of the pressure chamber with the gate of the mould, so that, when admitting pressure at z, the molten metal contained in pressure chamber b is forced into the mould through the bore of stem k.

I claim:

1. A pressure die-casting machine having, in combination, a metal container, a pressure chamber rigidly suspended therein and having a mouth at its one end and a compressed gas connection at its other end, a communication passage for filling said pressure chamber with molten metal from said metal container, a stem registering with said communication passage, one end of said stem being adapted to firmly and securely separate the interior of said pressure chamber from the interior of said metal container, a mould provided with a gate adapted to register with the mouth of said pressure chamber, and an operative connection between said mould and said stem so as to close said communication passage when the gate of said mould registers with the mouth of said pressure chamber.

2. A pressure die-casting machine having, in combination, a metal container, a pressure chamber rigidly suspended therein and having a mouth at its one end and a compressed gas connection at its other end, a communication passage for filling said pressure chamber with molten metal from said metal container, a stem registering with said communication passage, one end of said stem being adapted to firmly and securely separate the interior of said pressure chamber from the interior of said metal container, a mould provided with a gate adapted to register with the mouth of said pressure chamber, and a member extending from said mould, the other end of said stem being fixed to said member.

3. A pressure die-casting machine having, in combination, a metal ber rigidly suspended at its one end and a at its other end, an

container, a pressure chaintherein and having a mouth compressed gas connection inlet passage for filling said pressure chamber with molten metal from said metal container, a stem registering with said inlet passage, one end of said stem being adapted to firmly and securely separate the interior of said pressure chamber from the interior of said metal container, a mould provided with a gate adapted to register with the mouth of said pressure chamber, and a member extending from said mould, the other end of said stem being pivotally journalled in said member so as to permit 9. limited angular movement of said stem within said member.

4. A pressure die-casting machine having, in combination, a metal container, a pressure chamber rigidly suspended therein and having a mouth at its one end and a compressed gas connection at its other end, an inlet passage for filling said pressure chamber with molten metal from said metal container, a stem registering with said inlet passage, one end. of said stem being adapted to firmly and securely separate the interior of said pressure chamber from the interior of said metal container, the opposite end of said stem being formed spherical, a mould provided with a gate adapted to register with the mouth of said pressure chamber, and a member attached at one end so as to extend from of said member being provided with a. bearing having a detachable cover, circular grooves in corresponding parts of said bearing and said cover, a detachable annular ring within said bearing having an outer circumference provided with corresponding grooves and an inner surface adapted to receive the spherically shaped end of said stem, a thread in corresponding other parts in said bearing and said cover, and a screw registering with said thread in said bearing and acting as a counter-bearing for the spherical end of said stem.

5. A pressure die-casting machine having, in combination, a metal container, a pressure chamber within said metal container and cast integral therewith, said pressure chamber having a mouth at its one end and a compressed gas connection at its other end, a mould provided with a gate, and a hollow stem rigidly connected at one end with said mould and extending from the gate of said mould toward and into said container, the opposite end of said stem registering with said mouth and adapted to firmly and securely separate the interior of said pressure chamber from the interior of said metal container.

6. A pressure die-casting machine comprising a mould, a metal container, a pressure chamber' rigidly suspended within said metal container, an inlet passage in said pressure chamber for filling the same with molten metal from said metal container, and means for closing said inlet passage. said means being adjustably secured to said mould and adapted to close said inlet passage when the mould is brought into metal-receiving relationship with respect to said pressure chamber.

'7. A pressure die-casting machine comprising a mold, a metal container, a pressure chamber rigidly suspended within said metal container, a communication passage in said pressure chamber for filling the same with molten metal from said metal container, and means for closing said communication passage, said means comprising a stem in registry with said communication passage and adjustably secured to said mould, said stem being adapted to function when the mould is brought into metal-receiving relationship with respect to said pressure chamber.

8. A pressure die-casting machine comprising a container for molten metal, a mould positioned said mould, the other end above said container and having a molten metal inlet, a pressure chamber in said container, an inlet passage in said pressure chamber connecting the interior of said chamber with that of said container, said chamber having a pressure connection at one end and an outlet at the other end adapted to register with the inlet in said mould, a stem secured on said mould and pro- ,iecting into said container through an opening therein overlying the inlet passage in said pressure chamber, said stem being adapted to seal the inlet passage in the pressure chamber, and said stem being guided in the opening in said container in the operation of the die-castin machine.

9. A pressure die-casting machine comprising a container for molten metal, a mould positioned surechamber, said hollow stem being adapted to seal said chamber from said container, and said hollow stem being guided in the opening in said container in the operation of the die-casting machine.

KARL FRIEDRICH WAGNER. 

